Virtual Event: Threat Detection and Incident Response Summit - Watch Sessions
Connect with us

Hi, what are you looking for?



Emotet Resumes Activity After Five Months of Silence

The Emotet Trojan has resumed activity after more than five months of absence from the threat landscape, security researchers warn.

The Emotet Trojan has resumed activity after more than five months of absence from the threat landscape, security researchers warn.

Active for over half a decade, Emotet has evolved from a banking Trojan to information stealer and malware downloader, and has been rather quiet for the past year or so.

In September 2019, following a four-month vacation, Emotet recommenced activity with a new technique in its pocket: it was hijacking legitimate email conversations for successful spear-phishing.

The threat became quiet again at the beginning of this year, but last week security researchers observed the first malspam waves aimed at distributing the Trojan.

Just as in September, the malware’s operators are replying to existing email threads with messages that carry malicious URLs or attachments, Malwarebytes notes.

The high-volume attacks started in the early morning of July 17, 2020, but the first signs of a comeback were observed on July 13, with low volumes of malspam.

“Emotet resurfaced in a massive campaign today after being quiet for several months. The new campaign sports longtime Emotet tactics: emails carrying links or documents w/ highly obfuscated malicious macros that run a PowerShell script to download the payload from 5 download links,” Microsoft revealed on Twitter.

Advertisement. Scroll to continue reading.

The Trojan was silent for 160 days before the new attack surfaced, Proofpoint explains. On July 17, approximately a quarter million Emotet-related malicious messages were observed.

The Russian-speaking threat actor behind Emotet, which is tracked as TA542, took aim at multiple verticals in the United States and the United Kingdom, security researchers reported.

On compromised machines, Emotet would often download additional modules that enable it to steal sensitive information, including login credentials and email messages, and to spread to other machines on the local network.

Emotet has great damaging potential once it has compromised a machine on the network, especially since it is known to be dropping additional malware, such as the TrickBot Trojan, or specific ransomware families.

“The real damage that an Emotet compromise causes happens when it forms alliances with other malware gangs and in particular threat actors interested in dropping ransomware,” Malwarebytes warns.

Related: Emotet Returns, Spreads via Hijacked Email Conversations

Related: RDP-Capable TrickBot Targets Telecoms Sectors in U.S. and Hong Kong

Related: Constant Vigilance Requires Looking Back as Well as Forward

Written By

Ionut Arghire is an international correspondent for SecurityWeek.

Click to comment

Daily Briefing Newsletter

Subscribe to the SecurityWeek Email Briefing to stay informed on the latest threats, trends, and technology, along with insightful columns from industry experts.

SecurityWeek’s Threat Detection and Incident Response Summit brings together security practitioners from around the world to share war stories on breaches, APT attacks and threat intelligence.


Securityweek’s CISO Forum will address issues and challenges that are top of mind for today’s security leaders and what the future looks like as chief defenders of the enterprise.


Expert Insights

Related Content


The changing nature of what we still generally call ransomware will continue through 2023, driven by three primary conditions.


Luxury retailer Neiman Marcus Group informed some customers last week that their online accounts had been breached by hackers.


As it evolves, web3 will contain and increase all the security issues of web2 – and perhaps add a few more.


A recently disclosed vBulletin vulnerability, which had a zero-day status for roughly two days last week, was exploited in a hacker attack targeting the...


Satellite TV giant Dish Network confirmed that a recent outage was the result of a cyberattack and admitted that data was stolen.


Zendesk is informing customers about a data breach that started with an SMS phishing campaign targeting the company’s employees.

Artificial Intelligence

The release of OpenAI’s ChatGPT in late 2022 has demonstrated the potential of AI for both good and bad.

Artificial Intelligence

The degree of danger that may be introduced when adversaries start to use AI as an effective weapon of attack rather than a tool...